Hyperfine structure of the $2^3S-$state in the ${}^9$Be atom

TL;DR

This paper presents highly accurate calculations of the hyperfine structure of the 2^3S state in the ${}^9$Be atom, providing precise energy levels and splittings, and briefly explores the spectrum of low-lying triplet states.

Contribution

The study offers the first highly accurate computational determination of hyperfine structure levels in the ${}^9$Be atom's 2^3S state, including specific energy values and splittings.

Findings

Hyperfine structure levels for the 2^3S state are precisely calculated.

Hyperfine splittings are quantified with high accuracy.

Spectrum of low-lying triplet states is briefly analyzed.

Abstract

A number of bound states properties and the hyperfine structure of the 23S(L=0)-state in the Be atom are determined from the results of highly accurate computations. The energies of the hyperfine structure levels for this state are {\epsilon}(F=12) = -13725.635(7) MHz, {\epsilon}(F=32) = -5490.254(7) MHz and {\epsilon}(F=52) = 8235.381(7) MHz, respectively. The hyperfine structure splittings are {\Delta}12 = 8235.381(7) MHz and {\Delta}23 = 13725.635(7) MHz, respectively. The spectrum of low-lying (bound) triplet states in the Be atom is briefly investigated.